<!-- 父级页面：除登录页以外所有页面的公共部分-->
<template>
  <div style="display: flex;">
<!-- 左侧菜单栏  -->
   <div :style= " { width: (isCollapse ? '64px' : '208px')} ">
     <el-menu style="width: 100%;height: 100vh;"background-color="#3c82f5" text-color="#fff" active-text-color="#ff0" router unique-opened :collapse="isCollapse" :collapse-transition="false">
<!--  菜单顶部条 -->
       <el-row style="padding-top: 10px">
         <el-col :span="2"></el-col>
         <el-col :span="7" style="padding-left: 7px">
           <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height: 35px"></el-avatar>
         </el-col>
         <el-col :span="isCollapse ? 0 :13">
           <span style="color: #fff;font-weight: bold;position: relative;top:8px;left:2px;">智慧车辆</span>
         </el-col>
       </el-row>
       <el-sub-menu index="1">
         <template #title>
           <el-icon style="font-size: 21px;"><User/></el-icon>
           <span>用户管理</span>
         </template>
         <el-menu-item index="/user">用户列表</el-menu-item>
       </el-sub-menu>
       <el-sub-menu index="2">
         <template #title>
           <el-icon style="font-size: 21px;"><Van/></el-icon>
           <span>车辆管理</span>
         </template>
         <el-menu-item index="/vehicle">车辆列表</el-menu-item>
       </el-sub-menu>
       <el-sub-menu index="3">
         <template #title>
           <el-icon style="font-size: 21px;"><Location/></el-icon>
           <span>围栏管理</span>
         </template>
         <el-menu-item index="geofence">围栏列表</el-menu-item>
       </el-sub-menu>
       <el-sub-menu index="4">
         <template #title>
           <el-icon style="font-size: 21px;"><User/></el-icon>
           <span>调度管理</span>
         </template>
         <el-menu-item index="/application">用车申请</el-menu-item>
         <el-menu-item index="/audit">用车审批</el-menu-item>
         <el-menu-item index="distribute">车辆分配</el-menu-item>
       </el-sub-menu>
       <el-sub-menu index="5">
         <template #title>
           <el-icon style="font-size: 21px;"><MessageBox/></el-icon>
           <span>字典管理</span>
         </template>
         <el-menu-item index="dict">字典列表</el-menu-item>
       </el-sub-menu>
     </el-menu>
   </div>
<!-- 右侧菜单栏  -->
    <div :style=" { width:(isCollapse ? 'calc(100% - 64px)' : 'calc(100% - 208px)')}">
<!-- 右侧顶部条   -->
      <el-header style="height: 10vh;background-color: #fff;padding: 22px 0 0 20px">
<!-- 折叠图标+登录人姓名下拉菜单（退出登录） -->
       <el-row :gutter="10">
         <el-col :span="18">
           <el-icon style="font-size: 21px;" @click="changeCollapsed"><Expand/></el-icon>
         </el-col>
         <el-col :span="6" style="position: relative">
           <el-dropdown style="position: absolute;right: 20px;" trigger="click">
            <span style="font-size: 19px;font-weight: bold;">
              {{user.username}}
              <el-icon><arrow-down /></el-icon>
            </span>
            <template #dropdown>
             <el-dropdown-menu>
               <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
             </el-dropdown-menu>
            </template>
          </el-dropdown>
         </el-col>
       </el-row>
<!--  面包屑导航      -->
        <el-breadcrumb separator="/" style="position: relative;top: 20px">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadcrumb" >{{item}}</el-breadcrumb-item>
        </el-breadcrumb>
      </el-header>
<!-- 右侧区域     -->
      <el-main style="height: 90vh;padding: 0;overflow-y: scroll">
      <router-view/>
      </el-main>
    </div>
  </div>
</template>

<script setup>
import { onMounted,ref } from 'vue'
import { useRoute, useRouter } from 'vue-router'


//定义变量用来控制左侧菜单栏是否折叠
const isCollapse = ref(false);
//定义方法修改菜单栏的折叠状态
const changeCollapsed = () => {
  isCollapse.value = !isCollapse.value;
}

//获取当前登录的用户数据
const user = ref(getUser());
//定义退出登录的方法
const logout = () => {
  if (confirm('您确认要退出登录吗？')){
    //删除保存在localStorage中的用户数据
    localStorage.removeItem('user');
    //跳转到登录页面
    window.location.href='/login';
    //清空当前登录用户数据
    user.value = '';
  }
}
//定义数组来维护面包屑导航当前显示的值
const breadcrumb = ref([]);
//定义对象用来保存页面路径与面包屑值的对应关系
let map = {
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','车辆列表'],
  '/geofence':['围栏管理','围栏列表'],
  '/application':['调度管理','申请列表'],
  '/audit':['调度管理','审批列表'],
  '/distribute':['调度管理','车辆分配'],
  '/dict':['字典管理','字典列表'],
  '/geofenceMap':['围栏管理','绘制围栏']
}
//useRoute()是vue路由器提供的一个方法，用来获取当前组件的路由对象
const route = useRoute();
//定义更新面包屑值的方法
const updateBreadcrumb = (route) => {
  const path = route.path;
  breadcrumb.value = map[path]};

//页面一家在完毕立即调用的方法
onMounted(()=>{
  updateBreadcrumb(route);
});
//获取路由守卫，监听路由，只要path发生变化(包括点击左侧菜单栏)，就立即更新面包屑的值，再跳转
const router = useRouter();
router.beforeEach((to, from, next)=>{
  updateBreadcrumb(to);
  next();
})
</script>